package com.queue.lock;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 一个公平锁的例子
 * https://www.cnblogs.com/takumicx/p/9338983.html
 *
 * @author: chenhs
 * @date: Created in 10:07 2019/10/11
 **/
public class ReentrantLockTest1 {

    static Lock lock = new ReentrantLock(true);


    public static void main(String[] args) {
        for (int i = 0; i < 5; i++) {
            new Thread(new ThreadDemo(i)).start();
        }
    }


    static class ThreadDemo implements Runnable {

        Integer id;

        public ThreadDemo(Integer id) {
            this.id = id;
        }

        @Override
        public void run() {

            try {
                TimeUnit.MILLISECONDS.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            for (int i = 0; i < 2; i++) {
                lock.lock();
                System.out.println("获得锁的线程："+ id);
                lock.unlock();
            }

        }
    }

}
